dbatools

1.0.166

internal/functions/Invoke-CommandWithFallback.ps1

                                function Invoke-CommandWithFallback {

    <#

    When credentials are specified, it is possible that the chosen protocol would fail to connect with them.

    Fallback will use PSSessionConfiguration to create a session configuration on a remote machine that uses

    provided set of credentials by default. A new session will be created that uses this custom configuration

    and performs remote execution under defined set of credentials without relying on delegation or CredSSP.

    #>

    param (

        [DbaInstanceParameter]$ComputerName = $env:COMPUTERNAME,

        [object]$Credential,

        [scriptblock]$ScriptBlock,

        [object[]]$ArgumentList,

        [parameter(ValueFromPipeline)]

        [object[]]$InputObject,

        [ValidateSet('Default', 'Basic', 'Negotiate', 'NegotiateWithImplicitCredential', 'Credssp', 'Digest', 'Kerberos')]

        [string]$Authentication = 'Default',

        [switch]$Raw,

        [version]$RequiredPSVersion

    )

    try {

        Invoke-Command2 @PSBoundParameters

    } catch [System.Management.Automation.Remoting.PSRemotingTransportException] {

        # This implements a fallback scenario, when both credentials and fallback are specified, but the original session has failed

        # Credentials will be passed on through a default session and used as a default PSSessionConfiguration

        if ($Credential) {

            Write-Message -Level Verbose -Message "Initial connection to $($ComputerName.ComputerName) through $Authentication protocol unsuccessful, falling back to PSSession configurations | $($_.Exception.Message)"

            $configuration = Register-RemoteSessionConfiguration -Computer $ComputerName.ComputerName -Credential $Credential -Name dbatoolsInvokeCommandWithFailback -Confirm:$false

            if ($configuration.Successful) {

                $PSBoundParameters.ConfigurationName = $configuration.Name

                $PSBoundParameters.Authentication = 'Default'

                try {

                    Invoke-Command2 @PSBoundParameters

                } catch {

                    throw $_

                } finally {

                    # Unregister PSRemote configurations once completed. It's slow, but necessary - otherwise we're gonna have leftover junk with credentials on a remote

                    $unreg = Unregister-RemoteSessionConfiguration -ComputerName $ComputerName.ComputerName -Credential $Credential -Name $configuration.Name -Confirm:$false

                    if (-not $unreg.Successful) {

                        Write-Warning -Message "Failed to unregister PSSession Configurations on $($ComputerName.ComputerName) | $($configuration.Status)"

                    }

                }

            } else {

                Stop-Function -Message "Both $Authentication and failback connections failed | $($configuration.Status)" -ErrorRecord $_ -EnableException $true

            }

        } else {

            #default behavior

            throw $_

        }

    } catch {

        throw $_

    }

}

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# SIG # End signature block